Injection Molding
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POM Mold Deposit
Problem Phenomenon
White deposits gradually accumulate on the mold cavity surface, and scratches and uneven gloss appear on the part surface
Cause Analysis
During POM processing, low-molecular substances and degradation products volatilize and then condense on the mold surface to form mold deposit; excessive melt temperature, excessive injection rate, and poor venting all aggravate deposition
Solution
①Reduce injection filling rate and melt temperature; ②enlarge the gate and improve venting; ③clean the mold surface regularly, and in severe cases use hopper drying to improve thermal stability; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Mold deposit is POM's signature chronic disease; address temperature, rate, and venting simultaneously, combined with regular mold cleaning to maintain surface quality; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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